diff --git a/malcontent-control/application.c b/malcontent-control/application.c
index 0ba20be..8762981 100644
--- a/malcontent-control/application.c
+++ b/malcontent-control/application.c
@@ -102,6 +102,7 @@ mct_application_constructed (GObject *object)
         N_("User to select in the UI"),
         /* Translators: This is a placeholder for a command line argument value: */
         N_("USERNAME") },
+      { NULL, },
     };
 
   g_application_set_application_id (application, "org.freedesktop.MalcontentControl");